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Requirements of a traits class to be used with the function y_monotone_partition_2.
In addition to the types defined for the concept PartitionTraits_2, the following types are also required:
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Predicate object type that provides
CGAL::Comparision_result operator()(Point_2 p, Line_2 h) to compare
the x coordinate of p and the horizontal projection of p
on h.
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Function object type that provides
Line_2 operator()(Point_2 p, Point_2 q), which constructs and
returns the line defined by the points p and q.
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Function object type that provides
bool operator()(Line_2 l), which returns true iff the
line l is horizontal.
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A copy constructor and default constructor are required.
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In addition to the functions required for the concept PartitionTraits_2, the following functions that create instances of the above function object types must exist.
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